Seems a decent buy. Thought I got my excellent condition silver 172 with FSH, and cambelts done 48k on the clock, standard and a 2002 plate for £3500; and that was a good by in my opinion
I would want some more details about the alloys and check that it really does have full service history (it does not mention this on the advert - saying it has lots of receipts is often people trying to make up for lack of service history). The Cambelt has been done which is great as that’s £500-£800 to have changed. I saw so many 172's advertised as FSH but it was only on mileage i.e. the car is 8 years old and only done 48k, so they claim the cambelt is not due until 72k, even though its 3 years overdue as should have been done at 5 yrs old; thus ripe to go and cause some hefty engine damage! Its worth checking out the auxiliary belt has been done too.
Don't be fooled by that list of optional extras, they are all standard on the 172